From: Stephen Oliver (stevie_oliver@xxxxxxxxxxx)
Date: Thu Oct 25 2001 - 15:23:27 GMT-3
Back to my VLSM OSPF into IGRP scenario.
I have a router redistributing OSPF into IGRP and it has /26 and .27 subnets
on a B class address in the OSPF domain. I wanted to redistribute these
into IGRP which is running on an interface with a /24 subnet of a B class
address. So I decided on
# router ospf 1
# summary-address x.x.x.x 255.255.255.0
Then redistribute into IGRP.
When I type the summary address command the router immediately puts a route
to the summary address with next hop null 0 in the routing table. The route
is then picked up and advertised correctly into the IGRP domain.
I use three other routers to create the same problem and this time the
summary address command does NOT install the null route and the routes never
get into the IGRP domain. I have to manually install a static route to null
0 then it redistributes ok.
The router that automatically installs the null 0 route runs IOS 11.2(23).
The router that doesn't runs 12.0(3).
Is there a difference between these two versions in hos they treat the
summary-address command ?
I've decided the static route to null 0 is the preferable method but I'm
puzzled as to why the summary-address command works differently on the
different versions of IOS. Any ideaas ?
Thanks, Stevie.
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